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Chapter 25: Problem 18

What are the software components in a client-server DDBMS? Compare the twotier and three-tier client-server architectures.

Short Answer

Expert verified
Software components in a client-server DDBMS include the Database Management System (DBMS), Application Logic, and User Interface. In a two-tier client-server architecture, the user interface and application logic are on the client side while database storage and management are handled server-side. Three-tier architecture, on the other hand, separates the user interface, business logic, and data storage and access layer, providing more scalability and flexibility. While two-tier is easier to implement, three-tier offers greater flexibility and robustness.

Step by step solution

01

Understanding Client-Server DDBMS

A Distributed Database Management System (DDBMS) consists of a single logical database that is divided into a number of fragments. Each fragment is stored on one or several computers under the control of a separate DBMS, with the computers connected by a communications network. The software components in a client-server DDBMS usually include Database Management System (DBMS), Application Logic and User Interface.
02

Identifying two-tier architecture

In a two-tier client-server architecture, the user interface and application logic resides on the client side while the database storage and management is handled by the server side. The client sends SQL queries directly to the server over the network which then processes the queries and sends the result back to the client.
03

Identifying three-tier architecture

Three-tier architecture is a more advanced and flexible architecture. It consists of Presentation Layer or User Interface, Application Logic Layer or Business Logic and, Data Storage and Access Layer. Here, the client does not interact directly with the database server. Instead, the client communicates with the application server, which in turn interacts with the database server.
04

Comparing two-tier and three-tier architectures

Two-tier architecture is easier to maintain and implement as it is straightforward but it poses limitations on scalability, robustness and flexibility. On the other hand, three-tier architecture, although slightly difficult to implement, offers greater flexibility, scalability and robustness. It also separates concerns, thus making it easier to manage and update without affecting the system as a whole.

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Most popular questions from this chapter

How is a horizontal partitioning of a relation specified? How can a relation be put back together from a complete horizontal partitioning?

How is the decomposition of an update request different from the decomposition of a query? How are guard conditions and attribute lists of fragments used during the decomposition of an update request?

Why is data replication useful in DDBMSs? What typical units of data are replicated?

How is a vertical partitioning of a relation specified? How can a relation be put back together from a complete vertical partitioning?

Discuss the factors that affect query decomposition. How are guard conditions and attribute lists of fragments used during the query decomposition process?
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